Initial commit from data-logger code

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

.vscode/settings.json

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+{
+	"files.associations": {
+		"*.ejs": "html",
+		"*.conf": "cisco",
+		"*.dis": "cpp",
+		"optional": "cpp",
+		"istream": "cpp",
+		"ostream": "cpp",
+		"system_error": "cpp",
+		"array": "cpp",
+		"functional": "cpp",
+		"tuple": "cpp",
+		"type_traits": "cpp",
+		"utility": "cpp"
+	}
+}

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32dev]
+platform = espressif32
+board = esp32dev
+framework = arduino
+upload_speed = 921600
+monitor_speed = 115200
+lib_deps = 
+	knolleary/PubSubClient@^2.8
+	bblanchon/ArduinoJson@^6.21.3

src/main.cpp

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+#include <Arduino.h>
+#include <WiFi.h>
+#include <PubSubClient.h>
+#include <ArduinoJson.h>
+
+const char *ssid = "PET Aflytningsvogn #43";
+const char *password = "zwr33htm";
+
+const char *mqtt_server = "192.168.24.215";
+// const char *mqtt_server = "test.mosquitto.org";
+
+WiFiClient espClient;
+PubSubClient client(espClient);
+
+const int lm35_pin = 34; /* LM35 O/P pin */
+const int mic_pin = 35;
+const int light_pin = 32;
+const int motion_pin = 33;
+
+#define ADC_VREF_mV 3300.0 // in millivolt
+#define ADC_RESOLUTION 4096.0
+
+#define FILTER_LEN 15
+
+float readADC_Avg(int pin)
+{
+    float avg = analogRead(pin);
+    for (int i = 0; i < 10; i++)
+    {
+        avg = (avg + analogRead(pin)) / 2;
+        delay(20);
+    }
+    return avg;
+}
+
+void setup_wifi()
+{
+    delay(10);
+    // We start by connecting to a WiFi network
+    Serial.println();
+    Serial.print("Connecting to ");
+    Serial.println(ssid);
+
+    WiFi.begin(ssid, password);
+
+    while (WiFi.status() != WL_CONNECTED)
+    {
+        delay(500);
+        Serial.print(".");
+    }
+
+    Serial.println("");
+    Serial.println("WiFi connected");
+    Serial.println("IP address: ");
+    Serial.println(WiFi.localIP());
+}
+
+void reconnect()
+{
+    // Loop until we're reconnected
+    while (!client.connected())
+    {
+        Serial.print("Attempting MQTT connection...");
+        // Attempt to connect
+        if (client.connect("ESP8266Client"))
+        {
+            Serial.println("connected");
+        }
+        else
+        {
+            Serial.print("failed, rc=");
+            Serial.print(client.state());
+            Serial.println(" try again in 5 seconds");
+            // Wait 5 seconds before retrying
+            delay(5000);
+        }
+    }
+}
+
+void setup()
+{
+    Serial.begin(115200);
+    pinMode(lm35_pin, INPUT);
+	pinMode(mic_pin, INPUT);
+	pinMode(light_pin, INPUT);
+	pinMode(motion_pin, INPUT);
+
+	pinMode(13, OUTPUT);
+    digitalWrite(13, HIGH);
+
+    setup_wifi();
+    client.setServer(mqtt_server, 1883);
+}
+
+#define SOUND_MEASURE_INTERVAL 1000 * 10
+#define SOUND_HIGHEST_MEASURE_INTERVAL 200
+#define TEMP_MEASURE_INTERVAL 1000 * 10
+
+unsigned long previousTemperatureMillis = 0;
+unsigned long previousSoundMillis = 0;
+unsigned long previousHighestSoundMillis = 0;
+
+bool lastMotionState;
+
+uint16_t highestSound = 0;
+uint16_t runningAverageSound = 0;
+
+int j = 0;
+
+void loop()
+{
+    client.loop();
+    if (!client.connected())
+    {
+        reconnect();
+    }
+    j++;
+
+    unsigned long currentMillis = millis();
+
+    if (currentMillis - previousTemperatureMillis >= TEMP_MEASURE_INTERVAL)
+    {
+        // save the last time you blinked the LED
+        previousTemperatureMillis = currentMillis;
+
+        analogSetClockDiv(255);
+
+        float analogValueTemp = readADC_Avg(lm35_pin);
+        float analogValueLight = readADC_Avg(light_pin);
+
+        analogSetClockDiv(1);
+
+        float millivolts = analogValueTemp * (ADC_VREF_mV / ADC_RESOLUTION) * 2;
+        // float millivolts = analogReadMilliVolts(lm35_pin);
+        float celsius = millivolts / 10; // 6.5 is the callibration offset measured using an oscilliscope
+        Serial.print("raw= ");
+        Serial.print(analogValueTemp);
+        Serial.print(" in DegreeC= ");
+        Serial.println(celsius);
+
+        DynamicJsonDocument docTemp(1024);
+
+        docTemp["device"] = "esp32-1";
+        docTemp["type"] = "temperature";
+        docTemp["value"] = celsius;
+
+        char bufferTemp[1024];
+        size_t bufferTempSize = serializeJson(docTemp, bufferTemp);
+        client.publish("esp32/data", bufferTemp, bufferTempSize);
+
+        Serial.print("Light: ");
+        Serial.println(analogValueLight);
+
+        DynamicJsonDocument docLight(1024);
+
+        docLight["device"] = "esp32-1";
+        docLight["type"] = "light";
+        docLight["value"] = analogValueLight;
+
+        char bufferLight[1024];
+        size_t bufferLightSize = serializeJson(docLight, bufferLight);
+        client.publish("esp32/data", bufferLight, bufferLightSize);
+    }
+
+    uint16_t soundValue = analogRead(mic_pin);
+
+	if (soundValue > highestSound) {
+		highestSound = soundValue;
+	}
+
+    if (currentMillis - previousHighestSoundMillis >= SOUND_HIGHEST_MEASURE_INTERVAL)
+	{
+		previousHighestSoundMillis = currentMillis;
+
+		if (runningAverageSound == 0)
+		{
+			runningAverageSound = highestSound;
+		}
+		else
+		{
+			runningAverageSound = (runningAverageSound + highestSound) / 2;
+		}
+
+		highestSound = 0;
+	}
+
+    if (currentMillis - previousSoundMillis >= SOUND_MEASURE_INTERVAL)
+    {
+		previousSoundMillis = currentMillis;
+
+        Serial.print(j);
+        Serial.print(": sound: ");
+		Serial.println(runningAverageSound);
+
+        DynamicJsonDocument doc(1024);
+
+        doc["device"] = "esp32-1";
+        doc["type"] = "sound";
+        doc["value"] = runningAverageSound;
+
+        char buffer[1024];
+        size_t n = serializeJson(doc, buffer);
+        client.publish("esp32/data", buffer, n);
+
+		runningAverageSound = 0;
+        j = 0;
+	}
+
+    bool motionState = digitalRead(motion_pin);
+
+    if (lastMotionState != motionState) {
+        Serial.print("Motionstate: ");
+		Serial.println(motionState);
+
+        DynamicJsonDocument doc(1024);
+
+        doc["device"] = "esp32-1";
+        doc["type"] = "motion";
+        doc["value"] = motionState;
+
+        char buffer[1024];
+        size_t n = serializeJson(doc, buffer);
+        client.publish("esp32/data", buffer, n);
+
+        lastMotionState = motionState;
+    }
+}

test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html